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Derivative Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2016
Derivative Instruments And Hedging Activities Disclosure [Abstract] |
Notional Amounts and Estimated Fair Values of Outstanding Derivative Positions | The Company utilizes dealer quotations and observable market data inputs to substantiate internal valuation models. The notional amounts and estimated fair values of oil and gas derivative positions outstanding are presented in the following table:
|  |  |  | December 31, |
|  |  |  | 2016 |  |  | 2015 |
Oil and Natural Gas Swaps and Options |  | Notional Units |  | Notional Amount |  |  | Estimated Fair Value |  |  | Notional Amount |  |  | Estimated Fair Value |
|  |  |  | (Notional amounts and dollars in thousands) |
Oil |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative assets |  | Barrels |  |  | 83 |  |  | $ | 576 |  |  |  | 86 |  |  | $ | 604 |
Derivative liabilities |  | Barrels |  |  | (83 | ) |  |  | (496 | ) |  |  | (86 | ) |  |  | (378 | )
Natural Gas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative assets |  | MMBTUs |  |  | 1,900 |  |  |  | 993 |  |  |  | 3,920 |  |  |  | 1,342 |
Derivative liabilities |  | MMBTUs |  |  | (1,900 | ) |  |  | (810 | ) |  |  | (3,920 | ) |  |  | (611 | )
Total Fair Value |  | Included in |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative assets |  | Other assets |  |  |  |  |  |  | 1,569 |  |  |  |  |  |  |  | 1,946 |
Derivative liabilities |  | Other liabilities |  |  |  |  |  |  | (1,306 | ) |  |  |  |  |  |  | (989 | )
Recognized Derivative Income Included in Other Noninterest Income | The following table is a summary of the Company’s recognized income related to the activity, which was included in other noninterest income:
|  | Year Ended December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
|  | (Dollars in thousands) |
Derivative income |  | $ | 32 |  |  | $ | 341 |  |  | $ | 500 |
Summary of Company's Net Credit Exposure Relating to Oil and Gas Swaps and Options with Bank Counterparties | The following table is a summary of the Company’s net credit exposure relating to oil and gas swaps and options with bank counterparties:
|  | December 31, |
|  | 2016 |  |  | 2015 |
|  | (Dollars in thousands) |
Credit exposure |  | $ | — |  |  | $ | 37 |

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- Definition Tabular disclosure of credit derivatives which includes information by sellers of credit derivatives, about each credit derivative, or each group of similar credit derivatives, including (a) the nature of the credit derivative - its term, how it arose, the events or circumstances that would require the seller to perform under the credit derivative, and the current status of the payment/performance risk of the credit derivative; (b) the maximum potential amount of future payments (undiscounted) the seller could be required to make under the credit derivative; (c) the current fair value of the credit derivative; and (d) the nature of any recourse provisions under the credit derivative, and any assets held either as collateral or by third parties. A credit derivative is a derivative instrument (1) in which one or more of its underlyings are related to the credit risk of a specified entity (or a group of entities) or an index based on the credit risk of a group of entities and (2) that exposes the seller to potential loss from credit-risk-related events specified in the contract. Examples of credit derivatives within the scope of this paragraph include, but are not limited to, credit default swaps, credit spread options, and credit index products; also includes a hybrid instrument that has an embedded credit derivative (for example, but not limited to, a credit-linked note). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Credit Derivative -URI http://asc.fasb.org/extlink&oid=6854095 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4L -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5708777-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5708775-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5708773-113959 + Details
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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959 + Details
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